Firstly,..

( first off, to tick off, from the outset, 


 *yes I think so ( yes i would day so)

*to be tall order-  to be a difficult 


Also

( and also, 

**and come to think of it,

**on top of that ( in addition )

**On the one hand


But 

( mind you, but at the same time, that said, 


* i must admit-  i have to tell you the truth

*it is not always that easy-

* I must confess, - I must admit 

* a real struggle- very difficult 


To be honest

 (  to be totally up front,  quite honestly, 

I am not particularly fond of -  i am not vey fond of



In summary 

( overall, basically, nutshell


https://ieltsliz.com/wp-content/uploads/2090/07/Linking-words-for-IELTS-Speaking.pdf

https://ieltsliz.com/linking-words-for-ielts-speaking/